I have looked far and wide for an answer to this issue and Microsoft Support no longer answers questions for the One X.
I have both an Xbox Series X and an Xbox One X. My issue is that the Xbox One X's Download speed and Upload speed are absolutely horrid. 25.97 Mbps Down/36.53 Mbps Up. It is wirelessly connected as I am unable to hardwire it due to location issues. I know and understand that wifi is not the way to go, but it is my wife's and she doesn't play any lag-issue games. Prior to about 3 months ago, I was getting well over 100Mbps Down/Up wirelessly with it. It now will not go close to even 30 Mbps.
ARRIS BGW210-700 gateway (1Gbps Fiber):
IP Passthrough enabled
Allocation Mode: Passthrough
Passthrough Mode: DHCPS-fixed
All Firewall settings are off.
Connected to a ROG GT-AX11000 Router:
Game Boost: Enabled
Both the Series X and One X are set to gaming.
I have turned QoS off entirely and speeds dropped to 17.72 Mbps Down/23.75 Mbps Up
Gear Accelerator: On for Both the Series X & the One X
Open NAT: Profiles created for Both the Series X & One X
Port 88 (UDP)
Port 3074 (UDP and TCP)
Port 53 (UDP and TCP)
Port 80 (TCP)
Port 500 (UDP)
Port 3544 (UDP)
Port 4500 (UDP)
Full Cone NAT
Smart Connect: Enabled
Wireless Mode: Auto (No other Options)
802.11ax/Wifi 6 Mode: Enable
WiFi Agile Multiband: Enabled
Channel Bandwidth: I have tried every configuration from 20MHz to 160MHz and even 20/40/60/80/160MHz
Control Channel: I use InSSIDer and checked all channels, there is no overlap, in fact, our neighbors are so far away their wifi barely appears.
Multi-User MIMO: Enabled
OFDMA/802.11ax MU-MIMO: DL/UL OFDMA + MU-MIMO
IPv4 DNS: 126.96.36.199; 188.8.131.52
IPv6 DNS: 2606:4700:4700::1111; 2606:4700:4700::1001
DMZ: I even put it in a DMZ and there was no change.
I've even verified that it is connecting to the 5G band.
Short of Factory Resetting the Router and starting from scratch, I have no idea where I have gone wrong.
Xbox One X:
Packet Loss: 0%
Latency: 32 ms
Wireless Strength: 100%
I did a reset on the One X, then did a full Factory Reset on it. No change in wifi speeds. The issue has to be the Router. But no other devices in the house are experiencing a slowdown.